<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        a {
            text-decoration: none;
            color: #333;
        }

        ul li {
            list-style: none;
        }

        .box {
            width: 234px;
            height: 640px;
            background-color: rgba(0, 0, 0, .5);
            position: relative;
            font-size: 14px;

        }

        .box .herfbt {
            color: white;
        }

        .box li {
            width: 234px;
            height: 40px;
            line-height: 40px;
            display: block;
            padding: 0 10px;
            box-sizing: border-box;
            /* color: black; */
        }

        .box li:hover {
            background-color: orange;
        }

        .box li:hover .div1 {
            display: block;
        }

        .box li span {
            float: right;
        }

        .div1 {
            width: 400px;
            height: 640px;
            background-color: rgba(0, 0, 0, .1);
            position: absolute;
            left: 234px;
            top: 0;
            /* display: inline-block; */
            padding: 20px 10px;
            box-sizing: border-box;
            display: none;
        }

        .div2 {
            width: 100%;
            height: 40px;
            line-height: 40px;
            float: left;
        }

        .cf::after {
            content: '';
            clear: both;
            display: block;
        }

        .div2 dt,
        dd {
            height: 20px;
            float: left;
            border-right: 1px solid #ccc;
            line-height: 20px;
        }

        .div2 dd:last-child {
            border: none;
        }

        .div2 a {
            padding: 0 10px;
        }

        .div2 a:hover {
            color: orange;
        }
    </style>
</head>

<body>
    <div class="box">
        <ul>
            <li>
                <a href="#" class="herfbt">推荐商品 好物推荐<span>></span></a>
                <div class="div1 cf">
                    <div class="div2">
                        <dl>
                            <dt><a href="#">首页</a></dt>
                            <dd><a href="#">关于我们</a></dd>
                            <dd><a href="#">关于我们</a></dd>
                            <dd><a href="#">关于我们</a></dd>
                            <dd><a href="#">关于我们</a></dd>
                        </dl>
                    </div>
                    <div class="div2">
                        <dl>
                            <dt><a href="#">首页</a></dt>
                            <dd><a href="#">关于我们</a></dd>
                            <dd><a href="#">关于我们</a></dd>
                            <dd><a href="#">关于我们</a></dd>
                            <dd><a href="#">关于我们</a></dd>
                        </dl>
                    </div>
                    <div class="div2">
                        <dl>
                            <dt><a href="#">首页</a></dt>
                            <dd><a href="#">关于我们</a></dd>
                            <dd><a href="#">关于我们</a></dd>
                            <dd><a href="#">关于我们</a></dd>
                            <dd><a href="#">关于我们</a></dd>
                        </dl>
                    </div>
            </li>
        </ul>
    </div>
</body>

</html>